Path: chuka.playstation.co.uk!news
From: john.j@netway.at
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: Pls help a 3dimensional newbie...
Date: Tue, 09 Nov 1999 23:26:09 +0100
Organization: PlayStation Net Yaroze (SCEE)
Lines: 38
Message-ID: <38289F81.EAB12E24@netway.at>
References: <38234722.9002B4AA@netway.at> <38286787.5587F613@which.net>
NNTP-Posting-Host: t1p156.at-732.netway.at
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 4.5 [de] (Win95; I)
X-Accept-Language: de,en,nl

Andrew Murray schrieb:
> 
> I'm not 100% sure how to put this into code but I'd imagine that is you
> make a "handler" of the object then make this handler in some way always
> point towards this point, I advise taking a look at the camera viewpoint
> settings as this can be done similar to what you are looking for.

Hmmm...
- First of all: thanx a lot for your answer! (I thought noone would read it)  :D

I'll tell you the whole story:
I have an airplane, and (of course) I want a "fireblast" (dunno the word...)
at the end. Making an object (many polys - difficult in changing textures)
seemed to be not the best solution, so I had a (little) look at
"g-police2", and I thought: "it seems, this guys just use a SINGLE poly
and turn it always toward the camera..."

My only (???) problem is: view-changes (one time member of WORLD, the other
time member of the airplane itself....)

And I just dunno how to make an elegant (matrix) soltion for calculating
the angle (x- and y-axis) for the poly.

I thought about the possibilty to use the "view-vector" (coordinate-delta
between view and poly) and the poly-normal, so I have 2 vectors and
I dunno how to calculate these 2 to get a "delta" which I could use for
the rotationmatrix (I just dont wanna use real "sin" and "cos", because
of their speed) ...and my knowledge about the vector/matrices mathematics
is (despite of some good tutorials on the web) "under the dog" (*just tried
to translate a german idiom*   ;)

greetz
JJoS

 
> Or am I talking crap?
No way! - It sound's 200% better than the crap I wrote in my first
mail...   ;)